Ah yes, thanks mark, I ran through the howto again and now have it working. I'm not sure what the typo was, but It was a typo or a misunderstanding.
Anyway, all good now.
I can pass local mail from users on the mail server, but can't send or receive to gmail, and I can send to my ISP mail, but not receive from it. Anyway, I think it has something to do with MX records or something for me to figure out myself.
Thanks for your help